He is writing a letter______ a pen that I have never seen before.
| A．by | B．with | C．for | D．at |
—Have you known Dr. Jackson for a long time?
—Yes, since she ______ the Chinese Society.
| A．has joined | B．joins | C．had joined | D．joined |
I like getting up very early in summer. The morning air is so good ______.
| A．to be breathed | B．to breathe | C．breathing | D．being breathed |
The lawyer rarely wears anything other than jeans and a T-shirt ______ the season.
| A．whatever | B．wherever | C．whenever | D．however |
Let’s learn to use the problem we are facing ______ a stepping-stone to future success.
| A．to | B．for | C．as | D．by |
The performance ______ nearly three hours, but few people left the theatre early.
| A．covered | B．reached | C．played | D．lasted |